Hello everyone I'm new to the forum and joined hoping to find some information on the passlock security system on my 99 escalade. I did a search for passlock but nothing popped up that was similar to my problem so here I go. Occasionally the "Security" light will come on but usually goes away once I shut off the engine and restart. The irritating thing is that about once every two weeks or so, (I have only owned the vehicle since Jan 08) I get in and turn the key on and the security light blinks, if this happens it will start up but immediately shuts down because the fuel system shuts down. I understand that this is how the passlock system works. I have two different keys, one factory and one standard aftermarket, both seem to have the same notches and the problem happens with both keys. Usually if I leave the caddy sit for 15-30 minutes it will start again. I had it towed to the dealer the first time it happened and all they did was change the battery cables because they looked corroded. Apparently the computer didn't show that anything was wrong with the security system. Its getting real annoying because I never know if it will start or not. Any suggestions? Thanks in advance.